Visual measurement technique and test pattern for aperture offse

Details Visual measurement technique and test pattern for aperture offse Visual measurement technique and test pattern for aperture offse

1991-10-29

1994-05-31

Grimley, A. T.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

354 4, G01D 900

Patent

active

053173384

ABSTRACT:
A test pattern including an aperture image and a line image including a plurality of parallel lines, forming a measurement graticule, overlapping the aperture image, permits determination of dimensions for correction of alignment of image centerlines by inspection rather than complex measurement with stationary optical instruments. Since the line pattern preferably includes a plurality of parallel lines of predetermined width and separated by a predetermined spacing, the line image can be made to overlie the aperture image without obscuring features of the aperture image which are significant to determination of the alignment correction dimension.

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